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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33d55c77dc69d2773966beb4e4a66ae1b68ebc94cca5fbebf9360bc66b6deee' 
  AND token = '3Fw5jIdSyVoxx9hQpc3pkPWv9eVk5MwXJwB+FeWLUQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}